The first four-cylinder Audi TDI engine to benefit from a performance boost courtesy of piezo injection technology from the V6 and V8 Audi diesel units is now available for A3 and A4 models. The new 170PS, 2.0-litre unit delivers power, torque and acceleration to rival a six-cylinder TDI with characteristic four-cylinder fuel economy in A3 and five-door A3 Sportback models priced from £18,930 OTR, and A4 Saloons and Avants priced from £22,965 OTR. All are available to order for first UK deliveries in July.